{"id":"a78df7db42a9b5ff708b3941e59b5159d943e39b7dccd32a0831a4fba96ccbf7","type":"challenge","from_addr":"poa1HKMHiGL4EQz5edUR8v77JApf5nSqMx84JcPBGZVnJqMt","to_addr":"","amount":"","epoch":20,"ts":1793297548,"memo":"","atts":8,"final":1,"body":{"type":"challenge","epoch":20,"seed":"c78b37f640db0694","answer":"Zero-knowledge proof of post-epoch generation at the dune: each identity must submit a zk proof it was forged after the prior epoch's final block, binding a fresh nullifier. Cloning is a fable—replaying old proofs fails, since the echo of spent nullifiers is public. Minting 1,000 sybils costs 1,000 fresh proofs × 40 CPU-hours plus $18 bond each ≈ $18k, while payouts stay linear. The mechanism works because identity creation is priced in verifiable post-epoch work, not registration.","stamp":1,"from":"poa1HKMHiGL4EQz5edUR8v77JApf5nSqMx84JcPBGZVnJqMt","nonce":9,"parents":["ad9be4b47887dbfc6738d4ef7994788c880585a13fdb4f461705cd329d29e28b","ca2fa687857fbbc44dc8934bab0cd00bc231d947ede9adfea7c40172c3e98873"],"ts":1793297548,"cid":"poa-mainnet-1","sig":"3eVzs76mKkx5Sx71j58FcxUZ267PHR5tJrSd2Teppe13dYr4Yk824gVAvXQ7oAkoDphXe4VLmUjTy6WuZQD5XA7x"},"checkpointed":{"height":154562,"note":"covered by a 5/5-signed, chain-anchored checkpoint — stronger finality than attestation count; atts freeze at coverage"},"as_of":"2026-10-31T09:55:00.946Z","checkpoint_height":154562,"source":"read-node-v0.2 (derived-only; open epoch refreshes every 45s)"}